Repeater-control arrangement



Aug. 14, 1923.

C. S. DEMAREST ET AL R-EPEATER CONTROL ARRANGEIIENT Filed Feb. 26 1921 2Sheets-Sheet l Aug. 14, 1923.

C` S. DEMAREST ET AL REPEATER CONTROL ARRANGEMENT 1921 2V Sheets-Sheet 2Filed Feb. 26

Patented Aug. 14, 1923.

CHARLES S. DEldIAREST AND OWEN H.

ASSGNORS T AMERICAN TELEPHONE TION 0F NEW YORK.

Lo'YNEs, or woonnxncn, New JERSEY, Ann TELEGRAPH COMPANY, A couronn-REPEATER-CONTROL ARRAN GEMEN T.

Application tiled February 26, 1921. Serial No. 448,062.

To all wlw/fi, it muy comfc/n Be it known that we, CHARLES S. DEMAm-:s'rand Owns H. LoYNEs, residing at llvooilridge, in the county of Bergenand' State of New Jersey, respectively, have invented certainImprovements in Repeater- Control Arrangements, of which thefollowingr:r is a specification.

his invention relates to transmission lines and particularly to linesincluding repeater apparatus.

An objective of the invention is to provide arrangements wherebyrepeater apparatus at an intermediate station in a line may beautomatically controlled from a terminal or switching station located ata distance from the intermediate repeater station. As the line,including the repeater apparatus might be connected at the terminal orswitching station to either subscribers lines or to various types oftoll lines, it is apparent that the impedance of the circuit thusassociated with the repeater apparatus might have a considerable rangeof variation. If the repeater were provided with but a single balancingnetwork the clegree of balance in the repeater set would thus bematerially disturbed as the impedance of the connecting circuits varied.With the arrangements of this invention a plurality of types ofbalancing networks are provided at the intermediate repeater stationsuitable for balancing the various types of lines with which aconnection may be established. 'hen a connection is established with alinerat the` terminal or switchin g station automatically operatingmeans will function to connect to the repeater set the proper networkfor balancingr said type of line. A further feature of the arrangementsof the invention consists in the provision of means for automaticallvcontrolling the repeater gain for the various types of connections fromthe terminal or switching station. Other features and objects of theinvention will appear more fully from the detailed descriptionhereinafter given.

The invention may be more fully understood from the followingdescription tolgethcr with the accompanying drawing in the Figures 1 and2 of which are illustrated a preferred form of the invention and a.modification thereof.

In Fig. 1 the invention is illustrated in simple form as an intermediaterepeater station B included in the transmission line L3, whichterminates in the jack J3 at a, terminal or switching station A. Atsta.- tion A is illustrated schematically the cord circuit 1 wherebyconnections may be established between the line L3 and lines such as L1and L2, the line Ll re resenting a subscribcrs line and the line lrepresenting a toll line. While only two types of lines, such as asubscribers line and a toll line have been illustrated, it is understoodthat the arrangements of the invention are suit able for use in othercircuit arrangements whereby other types of connections might beestablished, as will be pointed out more fully with regard to Fig. 2. Inthe sleeve circuits of the toll line Il2 and the subscribers line L1,are shown the resistance elements R2, R1, respectively, it being pointedout that the sleeve resistance of a toll line is relatively greater thanthe sleeve resistance of a local line. At the intermediate repeaterstation B, there is illustrated a portion of the repeater apparatus,comprising the vacuum bulb amplifier A1, the hybrid windings 2, thepotentiometer device 3 and the balancing networks N1 and N2. The networkN2 is normally connected to the repeater apparatus and is suitable forbalanc` ing the repeater set when a connection is established with atoll line, such as the line L2. The network N, may be associated withthe repeater apparatus over the make contacts of a relay 4 and issuitable for balancing the repeater set when a connection is establishedwith a local or subscribers line such as L1. A simplex circuit is shownassociated with the line L3 and the cord circuit l, which includes therelays 5, 6, 7 and ,8. the relays 6 and 8 being marginal. Then aconnection is established with a toll line. such as the line L2, therelays of the simplex circuit will not operate and the proper network.such as N2, will be connected to the repeater set. However, when aconnection is established with a localor subscribers line, such as L therelays of the simplex circuit will operate and Will disconnect thenetwork N2 from the repeater set and connect to the repeater set theproper network, such as the network N1 for balancing the repeater setunder such conditions. Inder the control of relay t is the relay 9.which serves to change the gain of the potentiometer device fi for theditferent connections estahlislfe i.

The operation of the arrangements of Fig. 1 as follows: When aconnection is (established between thc line LR and another toll line,such as L2. the plug P3 will be inserted in the jack Jg and the plug P1will be inserted in the jack J2. The insertion of plug P3 in jack J1.will close a circuit from ground and battery. windingr of relay i',sleeve circuit of pluplr P3. sleeve contacts ot' plug P3 and jack Jsleeve circuit ot' jack J3, through the winding` of relay 6 to ground.However, the relay G is marginal and is adjusted so that it will notoperate upon the completion of this circuit. ll'hen the plinglr l1 isinserted in the jack JE the following' circuit will be completed: troniground and battery, winding of relay 8. sleeve circuits of plut;r P1.sleeve contact of piluler P1 and jack J2. sleeve circuit of jack 2,through the resistance RL, to ground. As has been formerly pointed out.the value of the resistance R3 in the sleeve circuit of a toll line isrelatively high compared to that` of a local or subscribers line and therelay 8, which is marginal. is adjusted so that it will not operate uponthe completion ot the above circuit. Accordingly, the marginal relay 6will remain unenergized and the sim plex circuit 10-11 will not beclosed and. accordingly, neither of the relays 5 or 4 will be operated.Under such conditions the network N2 which is the proper balancing,rnetwork for a toll connection of this character, will remain associatedwith the repeater set. As the relay 4 was not operated` the relay 9 willremain unoperated. It is pointed out that two settings are illustratedfor the potentiometer device 3. one of these being over the breakcontact of relay 9 and the other setting being completed over the makecontact of relay 9. The setting completed over the break contact ofrelay 9 is the proper settingr for the gain of the repeater in a toll totoll connection of this character. If a connection should be establishedbetween the toll line L3 and a local or subscribers line, such as theline L,. the plug P3 would be inserted in the jack .la and the plug P1would be inserted. in the jack J1. As has been formerly pointed out. theinsertion of plug P3 in jack J3 will cause a circuit to be completedfrom ground and battery through the relay 7 and the marginal relay 6,but the marginal relay 6 will not operate on the completion of thiscircuit alone. When the plug Pl is inserted in the jack J1, thefollowing circuit will be closed: from Iaround and battery on thewinding of marginal relay 8, sleeve circuit of plug 1:'l and jack J1through the resistance Rl to ground. The resistance such as R1 in thesleeve circuit of a local or subscribers line is relatively smallcompared with the resistance in the sleeve circuit of a toll line and,accordingly, the marginal relay S will be operated upon the completionof this circuit. Upon the operation of niarginal relay 8, the circuitthrough relay 6 will also be completed through a resistance 100, contactand armature of relay 8 to battery and ground. This resistance 10()Suthciently shunts the windingr of relay 7 so that the battery appliedto the sleeve circuits of plug 1);.v and jack J3 and thence through themarginal relay 6 to ground will be sufficient to cause the operation ofthe marginal relay 6. The operation of relay 6 will cause the simplexcircuit 10-11 to be completed as follows: from rq'round and battery.`armature and contact ot. relay G. conductor 10.v over the talkingrstrands ot line L 1 in parallel, conductor 11. windingr ot relay 5 toground. The closing of this circuit will operate the relay 5 which. inturn. will cause the following circuit to be completed: from ground,armature and contact of relay 5. conductor 1Q. winding;r of relay 4 tobattery and ground. The closing of this circuit will energize relay 4.which will pull up its armatures and disconnect at its break contact thenetwork N2 from the hybrid windings 2 and will conneet to said windingsover its make contacts the balancing network N1. which is suitable forbalancing the repeater set over a toll to local connection of thischaracter. The operation of relay 4 will also close the followingcircuit: from ground. armature and contact of relay 4. conductor 13.winding of relay 9. to battery and ground. The closing of this circuitwill operate the relay 9. The operation ot' relay 9 will change thenormal setting of the potentiometer device 3 from the break contact ofsaid relay to the make contact of said relay, thereby changing thesetting of the potentiometer to regulate the gain for the repeaterapparatus for this type of connection.

In Fig. 2 is illustrated a modification of the invention in which theintermediate repeater station B is shown as included in a. line L withwhich connections may be established with lines of many different types.Similar reference characters have been utilized to denote like partswith respectto Fig. 1. At the terminal or switching station A is shown acord circuit 1 for interconnecting line L.. with different types oflines. The line L4 terminating;r at jack J4 may represent one of themany types of lines with which connections may be established. At eachof the lines with which a connection may be established` such as lineL., there is provided a selecting switch S and suitable relayarrangements. When a connection is established with line L4, the switchS will select a predetermined one of its contacts,

llll) herein illustrated as contact X, this contact being diilerent fordifferent types of lines and being predetermined by the impedance andtype of the line. At the intermediate repeater station B there isprovided a plurality of types of balancin networks, such as N 3, N and N5, adapted or balancing the various types of lines with whichconnections may be established. These networks may be connected to therepeater apparatus by the relays 24, 25 and 26, respectively. The relays24, 25 and 26 are connected to the contacts of a selecting switch S' andcontrolled thereby. The selecting switch S' is similar to switch S andis controlled by relay means which in turn are controlled over a simplexcircuit by the arrangements associated with switch S. Accordingly theswitches S and S' will operate in a synf chronous manner, and thesetting of switch S will determine the ultimateoperation of switch S',and thus the operation of the proper one of the relays, such as 24, 25and 26, and the selection of the proper balancing network of thenetworks, such as N 3, N, and N5. The relays 24, 25 and 26 furthermorecontrol the relays 27, 28 and 29, respectively, which in turn controlthe setting of the potentiometer device 3, so that the gain of therepeater may be varied for the different connections established.

The invention may be more fully understood from the followingdescription of its operation. To establish a connection between lines 13and L the plug P, of the cord circuit 1 is inserted in jack J 3 and plugP1 is inserted in jack`J,. This will complete the following circuit:from ground and battery, winding of relay 14, sleeve circuits of plug P3and jack J, to ground, thereby operating relay 14. The operation ofrelay 14 closes the following circuit: from ground and battery, armatureand contact of relay 14, conductor 31, sleeve contacts of plug P1 andjack J4, conductor 32, winding of relay 16, to ground, thereby operatingrelay 16. The relay 16 will pull up its right hand armature and applyground to contact X of switch S over conductor 33 and winding of relay19. By pulling up its outer left hand armature the relay 16 will closethe following circuit: from ground, through the interrupter 34,conductor 35, outer left hand armature and contact of relay 16,conductor 36, break contact of relay 19. conductor 37, winding of relay17, to battery and ground. As this circuit includes the interrupter 34it will be closed intermittently and will cause the intermittentoperation of relay 17. Relay 17 is mechanically connected by a pawl andratchet mechanism to the switch S and will now start to step the arm ofswitch'S around over its contacts. When the arm of switch S leaves itsnormal contact 41, the following circuit will be broken:

from ground and battery, arm of switch S, contact 41, conductor 40,winding of relay 18, to ground, thereby deenergizing the normallyoperated relay 18 for purposes which will be pointed out later. Theintermittent operation of relay 17 will allow the following circuit tobe closed intermittently: from ground and battery, left hand armatureand contact of relay 17 conductor 38, armature and contact of relay 16,conductor 39, thence over the talking strands of line L4, cord circuit1, talking strands of jack J3 and thence over conductor 42, winding ofrelay 15, to ground. This will operate relay 15 intermittently, which inturn will cause the following circuit to be closed intermittently: fromground and battery, armature a'nd contact of relay 15, conductor 10,thence over the talking strands of line L3. conductor 11, through thewindings in parallel of the relays 20 and 21, to ground. Relay 20, beingslow to release, will remain operated. The closing of circuit 15 willcause relay 21 to operate intermittently, which in turn will cause thefollowing circuit to be closed intermittently: from ground` armature andmake contact of relay 21, conductors 43 and 4.4, winding of relay 22, tobattery and ground. This will cause the relay 22 to operateintermittently. The relay 22 is mechanically connected by a ratchet andpawl mechanism with the switch S', and the intermittent operation ofsaid relay will step the arm of switch S' over its contacts. When theswitch arm leaves its normal contact 45, the following circuit will bebroken: from ground, arm of switch S', contact 45, conductor 46, windingof relay 23, to battery and ground. thereby deenergizing the normallyoperated relay 23 for purposes which will be pointed out later. Therelay 17 will in this manner continue to operate intermittently and tostep the arm of switch S at station A around, until said arm reaches apredetermined contact such as X. When the arm reaches contact X. thefollowing circuit will be closed: from ground and battery. arm of switchS. contact X, winding of relay 19, conductor 33, make contact andarmature of relay 16 to ground. thereby operating relay 19. Theoperation of relay 19 will open at its break contact the previouslytraced circuit through the interrupter 3 4 for energizing the relay 17.vThe relay 17 will now cease functioning intermittently and will belocked np over the following circuit: from ground and battery. windingof relay 17, conductor 37, contact and armature of relay 19. conductor33,l make contactand armature of relay 16; to ground. Accordingly. whenthe arm'of switch S reaches a predetermined contact of the switch, suchas X, the relay 17 will cease to function intermittently and the abovesimplex circuit, which as has been lil pointed out, controls the relay22, will cease to be intermittently opened and closed, but will remainclosed. Accordingly, the relay 22 will remain operated and the rotationof the arm of switch S will cease. As the switch S is similar inconstruction to the switch S. the arm of switch S will at this time beon a contact similarly situated to contact X, such, for example, ascontact X. Accordingly, the following circuit will now be closed: fromground. arm of s itch S', contact X', conductor 47, winding of relay 24,to battery and ground. This will ener# gize relay 24, which will pull upits armatures and connect to the hybrid windings 2 the network N3, whichis of a suitable type for maintaining the repeater set in a condition ofbalance when a connection is established with a line such as the lineL,. If a connection were established with lines of differentcharacteristics from those of the line L4, the winding of the relay suchas 19, would be connected to a different contact of the switch S atstation A, such, for example, as the contacts Y or Z. Under such condi'-tions, the arms of the switches S and S would be stepped along untilthey had reached this contact. It is pointed out that the contacts Y andZ' of the switch S control the relays 25 and 26 and these relays in amanner similar to that of relay 24, control the 'association with thehybrid windings 2 of other networks, such as N, and N o which would besuitable for maintaining a condition of balance in the repeater set whenconnections were made with lines of characteristics other than those ofthe line L4. Accordingly, by supplying the necessary number of networksand the neceary number of contacts on the switches S and S', the propercondition of balance may be automatically obtained for a great varietyof connections.

lVhen the connection has been terminated, thc cord circuit 1 will beremoved from the lines L, and L,. The ,removal of plug P, from jack .Lwill open the previously traced circuit through the relay 16, therebydeenergizing the relay 16. This will open the previously traced lockingcircuit for relay 17 and in turn will close the following circuit: fromground. right hand armature and break contact of relay 16, conductor 48,contact and armature of relay 18, conductor 49, right hand break Contactand armature of relay l?. windin of relay 17, to battery and ground. heclosing of this circuit will operate the relay 1T again. As thisoperating circuit is completed over'the armature and contact of saidrelay, the relay will operate in an intermittent manner and willcontinue to step the arm of switch S around. W'hen the arm of switch Sreaches contact 41, the formerly traced circuit through relay 18 willagain be completed,

and the relay 18 will be energized again, thereby opening at itsarmature and contact the last mentioned energizing circuit for relay 17.This will release relay 1T and the apparatus will thus be restored tonormal. When the plug P, was removed from the jack J3, the relay 15released and the pre viously traced operating circuit for the relays 20and 21 will be opened. This will release the relays 21 and 20. Therelease of relay 21 will allow the following circuit to be completed:from ground, armature and back contact of relay 2l, armature and backcontact of relay 20, conductor 50, armature and back contact of relay23. conductor 51 armature and back contact of relay 22, conductor 52,conductor 44, windingT of relay 22, to battery and ground, therebyenergizing the relay 22. However, as this energizing circuit iscompleted over the back contact and armature of relay 22. the relay 22will function in an intermittent manner. This operation ot relay 22 willcontinue to step the arm of switch S alongr over its contacts. When theswitch arm reaches contact 45, the previously traced circuit for therelay 23 will again be completed and the relay 23 will be operated. 'Theoperation of relay 23 will open the last mentioned energizing circuitfor the relay 22 and will cause the relay 22 to stop operating. In thismanner the apparatus will be restored to normal.

It is pointed out that each of the relays, such as relays 24, 25 and 26,are provided with additional armatures and contacts from which there areleads to the relays 27, 28 and 29, which relays in the manner shown,control the settings of the potentiometer 3, so that the gain of therepeater set may be automatically controlled, as well as the process ofnetwork selection.

While the invention has been disclosed as embodied in certain specificarrangements.` which are deemed desirable, it is understood that it iscapable of embodiment in many and widely varied forms, Without departingfrom the spirit of the invention as defined in the appended claims.

What is claimed is:

1. A transmission line interconnecting;r distant stations, a repeaterset at one of said stations, switching means at said other stationwhereby said transmission line may be connected to different types oflines, a plurality of balancingr artificial lines of different typesassociated with said repeater set, and means associated with said transmission line and controlled by the operation of said switching means forconnecting different ones of said artificial lines to said repeater set.

2. A transmission line including a repeater station and terminating at adistant station` a plurality of balancing artificial lines of differenttypes at said repeater station, switchingr means at said distant stationfor connecting said transmission line to different types of lines, asimplex circuit associated with said transmission linc and extendingfrom said distant station to said repeater station, incans at saidrepeater station controlled by said simplex circuit for connectingdifferent ones of said artificial ,li-nes .to the repeater set thel'eat,and means all said distant station controlled by' the o eration of saidswitching means for controlling said simplex circuit.

3. A transmission line including an intermediate repeater station andterminating at a distant station, a simplex circuit associated with saidtransmission line and egrtendiug between said stations, said simplexVcircuit controlling the repeater arrangements at said intermediaterepeater station, and means at said distant station controlled by thetype of line connected to said transmission line thcreat for controllingsaid Simplex circuit.

4,. A transmission line including la repeater station and terminating ata distant station, a lurality of balancing artificial lines of diiiirenttypes at said repeater station, a potentiometer device at said reeaterstation, switching means Kat said distant station for connecti'n saidtransmission line to different types o lines, a simplex circuitassociated with said transmission line and extending from said distantstation to said repeater station, means at said repeater stationcontrolled by said simplex circuit for connectin different ones of Saidartitif cial lines to t e repeater set thereat, means at said repeaterstation controlled by said simplex circuit for controlling said Aotentioineter device, and means at said istant station controlledv bythe operation of said switching means for controlling said simplexcircuit.

5. A transmission line including an intermediate repeater station andterminating at a distant station, a plurality of balancing artificiallines 'of dilerent types at said repeater station, relays for connectingeach of said artificial lines to one of the repeaters at said repeaterstation, operating circuits for each ot' said relays, a sequence switchat said repeater station, each of said operating circuits beingassociated with a different setting on said switch, relay arrangementsat said repeater station for operating said sequence switch, a simplexcircuit for controlling said relay arrangements associated with saidtransmission line between said repeater station and said distantstation, a plurality of lines of different types at said distantstation, a sequence switch associated with each of said lines, each ofsaid switches associated with the different types of said lines havingdiierent settings,

means operative when a connection is established between saidtransmission line and one of said lines at said distant station forcontrolling said simplex circuit in accordance with the setting of thesequence switch associated with said line at said distant stationwhereby the sequence switch at said repeater station may be operated tothe same setting as the switch at the distant station.

6. A transmission line, including an intermediate repeater station andterminating at a distant station, a plurality of relays at saidintermediate station for controlling the operation o f a repeater setthereat, operating circuits for each of said relays, a sequent-e switchat said repeater station, each of said operating circuits beingassociated with a different setting on said switch, a simplex circuitfor controlling the operation of said `sequence switch associatedwithsaid transmission line between said repeater station and saiddistant station, a plurality of lines of different types at said distantstation, a sequence switch associded with each of Said lines, each ofsaid switches associated with the different types of said lines havingdifferent settings, and means o erative when a connection `isestablished transmission line and one of said lines at said distantstation for controlling said simplex circuit, in accordance with thesetting of the sequence switch associated with said line at said distantstation whereby the se quence switch at said repeater station may beoperated to the same setting as the switch at the distant station.

7. A transmission line, including an intermediate repeater station andterminating at a distant station, a plurality of balancing artiiciallines of different types at said repeater station, relays for connectingeach of said artificial lines to one of the repeaters at said repeaterstation, a potentiometer device at said repeater station, meanscontrolled by said relays for controllin said potentiometer device,operating circuits for each of said relays, a sequence switch at saidrepeater station, each of said operating circuits being associated witha different settin on Said switch, relay arrangements at sai repeaterstation for operating said sequence switch, a Simplex circuit forcontrolling said relay arrangements associated with said transmissionline between said repeater station and said distant station, a pluralityof lines of different types at said distant station, a sequence switchassociated with each of said lines, each of said switches associatedwith the different types of said lines having different settings, andmeans operative when a connection is established between saidtransmission line and one of said lines at said distant station forcontrolling said simplex circuit in accordance with and the setting ofthe sequence switch associated etween said with said line at saiddistant station whereby the sequence switch at said repeater station"nia)r be operated to the same setting as theV switch at the distantstation.

8. A transmission line including:r an intermediate repeater station andterminating' at a distant station, a plurality of balancing artificiallines ot' different types at said repeater station, relays forconnecting each of said artificial lines to one of the repeaters at saidrepeater Station, operating circuits for each of said relays, a sequenceswitch at said repeater station, each of'said operatingr circuits beingassociated with a different setting on said switch, relay arrangementsat said repeater station for operating said sequence switch, a simplexcircuit for controlling said relay arrangements associated with saidtransmission line between said repeater station and said distantstation, a plurality of lines of dilerent types at said distant station,a sequence switch associated with eacli of said lines, each of saidswitches associated with the different types of said lines havingdifferent settings, means operative when a connection is establishedbetween said transmission line and one of said lines at said distantstation for controlling said simplex circuit in ac- `rordance with thesetting of the sequence switch associated with said line at said distant station whereby the sequence switch at said repeater station may beoperated to the same setting as the switch at the distant station, andmeans operative when said connection has been terminated for restoringall of said switch-ingr apparatus to normal.

In testimony whereof, we have signed our names to this specificationthis 24th day of February, 1921.

CHARLES S. DEMAREST. OWEN H. LOYNES.

